title: Widely and continuously tunable terahertz synthesizer traceable to a microwave frequency standard.
abstract: We constructed a widely and continuously tunable terahertz frequency synthesizer traceable to a hydrogen maser linked to coordinated universal time. Photomixing of two optical frequency synthesizers, linked to the hydrogen maser via dual optical frequency combs, gave this THz synthesizer frequency uncertainty of 10⁻¹². To demonstrate the potential of wide and continuous tunability in the THz synthesizer, we tuned its output frequency up to 50 GHz discretely and 1.26 GHz continuously in the F-band while maintaining the unprecedented frequency uncertainty by using a uni-traveling-carrier photodiode as a photomixer. This THz synthesizer will be a powerful tool for broadband, high-precision THz spectroscopy and THz frequency metrology.
authors.affiliation: Graduate School of Engineering Science, Osaka University, Osaka, Japan. yasui@me.tokushima-u.ac.jp
authors.forename: Takeshi
authors.initials: T
authors.lastname: Yasui
authors.forename: Hisanari
authors.initials: H
authors.lastname: Takahashi
authors.forename: Kohji
authors.initials: K
authors.lastname: Kawamoto
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Iwamoto
authors.forename: Kaoru
authors.initials: K
authors.lastname: Arai
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Araki
authors.forename: Hajime
authors.initials: H
authors.lastname: Inaba
authors.forename: Kaoru
authors.initials: K
authors.lastname: Minoshima
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D055096:Optical Devices; D009991:Oscillometry / Q000295:instrumentation*; D055053:Terahertz Radiation; D013997:Time Factors